sox FAIL util: Unable to load MAD decoder library (libmad) function "mad_stream_buffer"

Compiling SOX with Lame and Libmad for Windows http://www.codeproject.com/KB/aspnet/Compiling_SOX_with_Lame.aspx

for compiling from source:

since the the tutorial http://www.codeproject.com/KB/aspnet/Compiling_SOX_with_Lame.aspx is rather dated (and did not work for me with more recent VisualStudio versions):
the SOX project contains ready-to-use Visual Studio projects for compiling SOX and its dependencies/libraries on Windows (e.g. using a Visual Studio Community Edition).

The SOX source code repository at SourceForge contains a directory msvc10 (and also msvc9) for compiling SOX and its dependencies with VisualStudio. Detailed instructions for that are in the Readme.txt.

So, for example, for only compiling libmad.dll:

• clone SOX repository, e.g. to directory sox-code/

git clone https://git.code.sf.net/p/sox/code sox-code

• download libmad source code from SourceForge and decompress to directory libmad/ (cf. instructions of the SOX VisualStudio Readme.txt, see link above), i.e. the directory structure should look like

sox-code/
libmad/

• open the VisualStudio project file (*.sln) in directory sox-code/msvc10 (if needed, change build configuration form Debug to Release)
• in the Solution Explorer window open context-menu for sub-project LibMad and select Build (or in older VS versions Project Only → Build Only LibMad)
• afterwards the compiled DLL is in sox-code/msvc10/Release (or Debug depending on the selected configuration)

tested with VisualStudio 2010 and Visual Studio 2017 CE